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Electrical Machines

Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 4
 2
 1
 8

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Electrical Machines
In case of a dc motor the ratio Eb / E is indicative of

  ratio of input to output voltage.
  ratio of starting to running torque.
  efficiency.
  ratio of starting to running current.

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Electrical Machines
When a transformer is loaded, the secondary terminal voltage drops. That means power factor is

 leading.
  lagging.
 unity.
 zero.

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Electrical Machines
Eddy current loss will depends on

All of these
 Thickness
 Flux density
 Frequency

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

 4 %.
  zero.
  less than 1 %.
 1.5 %.

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Electrical Machines
In an induction motor, air gap power is 10 Kw and mechanically developed power is 8 Kw. What are the rotor ohmic losses?

 0.5Kw
 2KW
 3KW
 1.5KW

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